test: Add and improve coverage thresholds across packages

Added coverage thresholds to all shared lib packages and increased
server thresholds to ensure better code quality and confidence.

Lib package thresholds:
- dependency-resolver: 90% stmts/lines, 85% branches, 100% funcs
- git-utils: 65% stmts/lines, 35% branches, 75% funcs
- utils: 15% stmts/lines/funcs, 25% branches (only error-handler tested)
- platform: 60% stmts/lines/branches, 40% funcs (only subprocess tested)

Server thresholds increased:
- From: 55% lines, 50% funcs, 50% branches, 55% stmts
- To: 60% lines, 75% funcs, 55% branches, 60% stmts
- Current actual: 64% lines, 78% funcs, 56% branches, 64% stmts

All tests passing with new thresholds. Lower thresholds on utils and
platform reflect that only some files have tests currently. These will
be increased as more tests are added.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

apps/server/vitest.config.ts

@@ -17,12 +17,12 @@ export default defineConfig({
         "src/routes/**", // Routes are better tested with integration tests
       ],
       thresholds: {
-        // Thresholds lowered after moving lib files to shared packages
-        // TODO: Gradually increase as we add more tests
-        lines: 55,
-        functions: 50,
-        branches: 50,
-        statements: 55,
+        // Increased thresholds to ensure better code quality
+        // Current coverage: 64% stmts, 56% branches, 78% funcs, 64% lines
+        lines: 60,
+        functions: 75,
+        branches: 55,
+        statements: 60,
       },
     },
     include: ["tests/**/*.test.ts", "tests/**/*.spec.ts"],

libs/dependency-resolver/vitest.config.ts

@@ -0,0 +1,21 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: "node",
+    include: ["tests/**/*.test.ts"],
+    coverage: {
+      provider: "v8",
+      reporter: ["text", "json", "html"],
+      include: ["src/**/*.ts"],
+      exclude: ["src/**/*.d.ts", "src/index.ts"],
+      thresholds: {
+        lines: 90,
+        functions: 100,
+        branches: 85,
+        statements: 90,
+      },
+    },
+  },
+});

libs/git-utils/vitest.config.ts

@@ -0,0 +1,21 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: "node",
+    include: ["tests/**/*.test.ts"],
+    coverage: {
+      provider: "v8",
+      reporter: ["text", "json", "html"],
+      include: ["src/**/*.ts"],
+      exclude: ["src/**/*.d.ts", "src/index.ts", "src/types.ts"],
+      thresholds: {
+        lines: 65,
+        functions: 75,
+        branches: 35,
+        statements: 65,
+      },
+    },
+  },
+});

libs/platform/vitest.config.ts

@@ -8,6 +8,16 @@ export default defineConfig({
     coverage: {
       provider: "v8",
       reporter: ["text", "json", "html"],
+      include: ["src/**/*.ts"],
+      exclude: ["src/**/*.d.ts", "src/index.ts"],
+      thresholds: {
+        // Current overall coverage: ~64% (only subprocess.ts well tested)
+        // Set realistic thresholds until more files are tested
+        lines: 60,
+        functions: 40,
+        branches: 60,
+        statements: 60,
+      },
     },
   },
 });

libs/utils/vitest.config.ts

@@ -0,0 +1,23 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: "node",
+    include: ["tests/**/*.test.ts"],
+    coverage: {
+      provider: "v8",
+      reporter: ["text", "json", "html"],
+      include: ["src/**/*.ts"],
+      exclude: ["src/**/*.d.ts", "src/index.ts"],
+      thresholds: {
+        // Current overall coverage: ~19% (only error-handler.ts tested)
+        // Set modest thresholds until more files are tested
+        lines: 15,
+        functions: 15,
+        branches: 25,
+        statements: 15,
+      },
+    },
+  },
+});